1377BP

Product Overview

1377BP is commonly associated with onsemi NCP1377BPG / NCP1377BP, a PWM current-mode controller designed for free-running quasi-resonant flyback converter operation. The device combines a true current-mode modulator with a demagnetization detector to support borderline / critical conduction mode operation and minimum drain-voltage switching. With dynamic self-supply operation, skip-cycle standby support, soft-start function, overvoltage protection and DIP-7 package options depending on the exact ordering code, it is suitable for AC-DC adapters, offline power supplies, consumer electronics, auxiliary power supplies, chargers, industrial power boards and legacy SMPS repair applications.

Key Features

• Manufacturer: onsemi / ON Semiconductor

• Marking / Short Part Number: 1377BP

• Full / Related Part Number: NCP1377BPG, NCP1377BP, NCP1377B and related NCP1377 variants

• Device Type: PWM current-mode controller

• Product Category: Power Management IC / offline PWM controller

• Control Method: Current-mode control

• Operating Mode: Free-running quasi-resonant operation

• Conduction Mode Support: Borderline / critical conduction mode operation

• Demagnetization Feature: Integrated demagnetization detection through auxiliary winding sensing

• Switching Feature: Minimum drain-voltage switching for reduced switching loss and EMI

• Startup / Supply Feature: Dynamic self-supply operation depending on circuit design

• Standby Feature: Skip-cycle operation for improved light-load and standby performance

• Soft-Start Feature: Internal soft-start function to reduce startup stress

• Protection Feature: Overvoltage protection, overcurrent protection and fault management functions depending on datasheet version

• Latch Feature: B-version overvoltage detection behavior and sampling time should be verified from the exact datasheet

• Package Type: PDIP-7 package for NCP1377BPG / BP version

• Mounting Type: Through-hole mounting

• Key Features: Quasi-resonant flyback control, current-mode modulation, demagnetization detection, soft start, skip-cycle standby, protection functions and DIP-7 package support

• Typical Use: AC-DC adapters, offline flyback converters, auxiliary power supplies, chargers, consumer power supplies, industrial SMPS boards and repair applications

• Ordering / Packaging Note: 1377BP is usually a shortened marking-style reference for NCP1377BPG / NCP1377BP variants; buyers should verify the full onsemi ordering code, package suffix, controller version, top marking, packing format and datasheet revision before production or repair use.

Applications

1377BP can be used in electronic systems that require a quasi-resonant current-mode PWM controller for efficient offline flyback power conversion. Typical applications include AC-DC adapters, battery chargers, consumer electronics power supplies, auxiliary power supplies, set-top box power boards, printer power supplies, industrial control power modules, standby power circuits, maintenance projects and legacy SMPS repair. It is also suitable for BOM review where an onsemi NCP1377B family quasi-resonant PWM controller is required.

Quality & Sourcing

Antrex Electronics can support 1377BP sourcing with stock availability checks, RFQ quotation, package confirmation, date code review and shipment arrangement. For project-based purchasing, buyers can provide quantity, target price, required date code, packaging requirements and application information for faster quotation support.

For quality control, Antrex Electronics can help arrange product photos, label review, visual inspection and third-party testing support when required. OEMs, EMS providers, repair centers and electronic component buyers are welcome to send BOM lists or hard-to-find part requests for sourcing assistance.